Introduction
MQ7 MQ-7 Carbon Monoxide Coal gas Sensor detects the concentrations of CO in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of 10 to 10,000 ppm and can operate at temperatures from -10 to 50°C and consumes much less than 150 mA at 5V. This module presents each digital and analog output and edge level for virtual output that may be difficulty adjusted with the use of the preset on the board. The MQ-7 sensor module can be easily interfaced with Microcontrollers, Arduino, and many other modules, etc.
Features of MQ7 Sensor
- The analog output voltage, the higher the concentration the higher the voltage.
- The carbon monoxide detection with better sensitivity.
- There are four screw holes for easy positioning;
- With a long service life and reliable stability
- Rapid response and recovery characteristics
Pinout of MQ7 Sensor
| Pin Name | Description |
| VCC | Power Supply Pin |
| GND | Ground Pin |
| DOUT | Digital Signal Output Pin |
| AOUT | Analog Signal Output Pin |
Specifications of MQ7 Sensor
| Product Dimensions | 32 x 20 x 22 mm (LxWxH) |
| Operating voltage | DC 5 V |
| IC driver | LM 393. |
| Reaction time | ≤ 1 s |
| Heating current | ≤ 180 mA. |
| Heating resistance | ± 31ohm 3ohm. |
| Return time | ≤ 30 s. |
| Sensitivity | ≥ 3%. |
| Size | 11 x 33 x 20 mm. |
| Range | 10 to 1000 ppm. |
| Characteristic gas | 100 ppm CO. |
| Sensitive resistance | 2 to 20 10kohm 10kohm at 100ppm CO. |
Datasheet of MQ7 Sensor
Download (ABC Name) Datasheet from the link given below.